The Veil. A new End mob

The Veil would be a mob with two forms. It spawns as a cloud of black pixels with small specks of pale white or gray light. It could hover around and occasionally fly up 5-10 blocks before returning to the ground. When a player approaches, it falls to the ground and turns into a strange humanoid figure with wispy black trails around it and pale light so its silhouette can be seen in low light. It would mostly be a melee mob but occasionally it can turn back into the cloud form, shoot some sort of projectile at you, then turn back into the ground form. For loot it could drop Shadow Shards. These can be used to create Shadow Lanterns and Torches that give off an unusual light. Other things in the End could provide Shadow Dust which can be crafted into Shadow Shards so that building materials can be obtained without fighting the Veil but fighting it is still useful. This mob would be a rare spawn and never spawn inside the center island. This way it never interferes with the Ender Dragon fight